day: Tag; etc. H. 71 , 179 , 370 f, 409 , 412 f, 415 [BTMR  ]

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Heidegger’s interpretation of Dasein purports to show it ‘as it is firstly and mostly [zunächst und zumeist] in its average everydayness [Alltäglichkeit]’ (SZ  , 16). Tag, ‘day’, and all, ‘all, every’, furnish: Alltag, ‘weekday; everyday life’; alltäglich, ‘daily; everyday, ordinary’; and Alltäglichkeit, ‘everydayness, ordinariness’. In contrast to a ‘distinctive, definite way of existing’, everydayness is Dasein’s ‘indifferent Firstly and Mostly [Zunächst und Zumeist]’. Since it is so close to us, it is usually overlooked: ‘What is ontically closest and most familiar is what is ontologically furthest, unknown and constantly overlooked in its ontological meaning’ (SZ  , 43). Alltäglichkeit ‘clearly means that mode of existing which Dasein observes “every day” [‘alle Tage’].’ [Inwood  ; InwoodHD]